| Answer | Crossword Clue |
|---|---|
| burseed | stickseed, Lappula echinata, introduced into North America from Europe |
| bluegrass | A bluish-green grass that was introduced into North America from northern Europe. It is widely grown for fodder, esp. in Kentucky and Virginia |
| nutria | large South American semiaquatic rodent (Myocastor coypus) with webbed hind feet and a round nearly hairless tail that has been introduced into parts of Europe, Asia, and North America |
| horsemint | wild mint, Mentha longifolia, introduced into America from Europe, having spikes of lilac flowers |
